Adjustable automatic rheostat.



C. H. LIAYLURD. I ADJUSTABLE IUTOMATIC RHEOSTAT.

---w .N -mil f6@ ITI 45 1 ally employed to generate the current in thesTaTEs PATENT OFFICE.

CHARLES It.' GarLoiw,

or CHICAGO, ILLINOIS.

ADJUSTABLE airroMATIc ieHEosTa'T;

il ,OSS-,342.

- Speoitlcat'ion of Letters Patent.. Patented Sept. 10, 1912.Appiication nica september e, icio. serial No. 580.562,

i To all whom Ait may concern I matic Rheostats, -of which t Be it knownthat I, CHARLES'H. GAYLORD, a citizen of the United States, and aresident of Chicago, inthe county of Cook and State of Illinois,have-invented certain newy 4'and useful Improvements in Adj stableAutollie following, ywhen taken in connection with the drawing vaccompanying and` forming apart hereof, is

a full and complete description, suilicient'to' enable those skilled inthe art to which'it A 'further object of the invention is to obtain adevice of the kind named which will be simple' in construction, easy tooperate,

. anisms included within the termsof thel not liable to get out oforder, and economi'- `call`y made. l

Further objects are setforth in the mechclaims hereinafter recited.

v.top plan view of o Y bodying thisinvention; and Fig. 2 is a sideIn`the drawing :referred to Figure 1 is a ne side of the device'emelevation ,ofv saiddevice, with an elect-ric generatoranda platingbath diagrammati- .cally shown; andv Fig. 3 is'an end elevation .f ofthedevice; Fig. 4 a section, -on an enlarged scale ,'of a portion ofthe' resistance coil and a nortion of lits surrounding cylinder,forminglementsrof the device. Fig. 5

end of one of the'standards l,of the device, .10

is an elevatiomon an enlarged scale, of one with adjacent parts, andFig'. 6 isa diagrammatic View. of the electric circuit of the device.

Similar letters refer to similar parts l throughout the several views.

A is an electric generator of the kind usu plating bath of an ordinaryelectroplating outfit, and B is said bath.

C is the base on whi h the several elements ci the device embodying theinvention are mounted. I have made base C of slate.

D, D', are standards attached to base C. Standards D,^D, areelectrically insulated from each other.

E, E', are arms which. are respectively provided with hubs e, e', andsaid hubsa're rotatably mounted in standards D, D; each .of said armsvbeing in elect-ric connection with the standard in Which-it rotates.Arm D forms an electric terminal as will be 'hereinafter shown.

E (Fig. v5), are rings of insulating material which are respectivelyforced into .axial apertures in the hubs e 'andF is a 'cylinderprovidedwith heads f at its ends, each of said heads havingv a hub fwhich Thearms E, E', together with the cylinder F are t-hus rotatablymounted inthe standardsD Whilejoine'a together so asto retain 'at alltimes the ysame .relative position. Cylinder F is provided withspiralgroove Fy extending around it and from one end thereyot to the other. lGr is a covering of non-conducting material applied to the periphery ofcylinder covering G of granite 'ware as it is termed. H is an electricconducting Wire laid in yspiral groove F and electrically connected'arms E, E, at its ends. The hub e of arm E is provided with hand Wheele which is gether with cylinder Fand arm E may be This rotation is .todetermine the amperes delivered by theV generator through cutting out orputting iii-portions of the resistance coil or rheostat -tormed bythewire H.

" I- is ra brush of electric conducting maable'on the4 rod J from oneend thereof to .base C. n

L is an electric conducting wire connected at one end to the 'generatorA, and at Vthe other end to a terminal of switch L.

L is a wire from the remaining terminal of switch L to terminal K, and Zis an electric conducting-Wire connected at one end to the terminal Kand at` the other end to the brush I. The wire H is electricallyiconnected at one end thereof to the terminal c, through arm E andstandard D.

ed at one end to the terminal .1c and atthe other end to one o f theelectrodes of bath B,

fitsinto 'the ring E of insulating material.l

Ihave made cylinder E of cast iron and rigidly attached thereto so lthatsaid' arm t0-- the other;y K, lc, are electric terminalsont-o.'standard's D, D', bv attaching it to the Vrotated by theturning'of said hand Wheel.

terial, mounted on rod J. Rod J isinounti `ed* in standards D`, D.BrushI is in electric contact With thewire H, 'and is mov- M is anelectric conducting wire connect.-

d is e 'Wire connected at one end to theother electrode of hath lganclat the other end to the generator A. v

N is an electro-magnet coilfn is ythe' armature of coil' N. The coil ,Nand lite armature f1/.forms a. solenoid.' The arn1ature n vwhenWithdrawn from the coil N electrically 4connects theterrninal-e E, l' of'4s-Witch L', and when said armature n, is

drawn into theeoil N, (upon an electric currentlowing through said coil)it is thereby disconnected' from-one ot saidterminals to open theswitcha When no current is passing through the coil l@ the switch L" mayhe closed., but when a current isv specti flowing .tllough said coil,the arrnature 'n is drawn from electrical"Contact -with teru andhourhand@V v Y N, and at the other end.

4niinal L, therehjf opening Said switchgi and Vsaid 'switch is held openso long es said coil ace or" i l f u to a corresponding. terminal' if"on the T is a wire attached at oneend'to generw tor A and at the otherend tothe coil N, and t is a Wire attached at Vone' end to the coil tohand of face of clock f.

and Wire 'mi tothe generatori A,

T' isv a Wire attached et one. end to liantl Q" and at theother end,generator A.- `lllhen the hand CW and the hand Q," are both in electricContact 'with the -terniinele which are Connected by a given Wire E, anelectric circuit' is established from lthe generator A' over Wire T toand through the -ooil N, thence over 'Wire to hand oversaid hand to theterminal with which saidV hand is in electrical Contact, from said.terminal over Wire R toa Correspending` .terf ininal P', frein saidterminal ,over hand Q" to Wire T' and over said wire T'haclr to thegenerator A.. .The flowing of an electric current over the vlast abovedescribed circuit energizes the coil N and its armature u is 'drawnthereinto, thus withdrawing it from terminal Z' of switch L'. The switchl] 'is in the cirouit'Whie-h comprises generator A, WireL, switch li',Wire li", terminal l,

` Wire Z" brush l resistance coil ll arm E'. 7 7 5 standard D",'terminal 7s, Wire M, hath B,

, along on retienen -f I Ey turning the hand Whee der F is turned, and'the .hrnfs isf moved in Contact with thedange 'separating the the eylinfrod J throughaitl rush com several. turns oi? lthe spiral groove ll. The

brush l nay, also, be moved hy hand along .its roel i to he brought intoContact With the H at any desired point; B31 making the cylinder Flrot-ataloleand the hrnsh l non-rotatable, anydesired length or' theref' L'ai-stance coil ll inay be cut out oi' the circuit,

and any desired number of 'almperes of cur rent utilized in the vplatinghath B.

l danni-f l. rebase, standards on the-hasef`armsre-` vvided 'With hulls,"and Said f mounted inv thestandards, a provided.' with o; peripheral'spiralgroove, a spiraliy wound resistance eoil mounted in said groot/eto 'turn with said arms, a non-rotatably mounted brush in electriccontact, `with one turnofthe Wire or" said coil, and inineehanical'fcoutact with said spiral groove, termnalS'onsaid hase,

rely n,

and electric conductors froinone of said terrninals toene endof'eaidcoil and ntrom the other ot said 'terminals tothe brush, all arranged sothat .the turning oit 'said -arnis,`

cylinders and Spirally visuiund resistance coil constitute a rotatableadjust-nient which' varies the length of said Wirehetween seid brush undthe terminal connected to the end ,of the wiren i A hase, standardsonthe hase, arms re spediively7 provided Withhubs and said hulosrotatably rncaintc'edl in the standards, and' one; of said arms 1nelectrical conducting con-- tact with 'one or said standards, acylinder, rotatably -niorunx-J-cl in said standards, a. han@ Wheelattached toonel oli Selci ends, said cylinder provided Wit-ha 'peripherl spiral' groove, acoveiing'of electrical non-eonductinginaterial tosaid cylinder, a resistance coil consisting or' a spirally'wound Wire inthe groove onsaidcylinder, one end of said lwire attached to thearrnwhich iS- in velectricalcontact withv the standard, a rod mounted tolhe parallel to the axis of the cylinder, a brush morably mounted onsaid'v rod., and said brush in contact'with'one turn of the Wire of saidcoil and with saidspiral groove, terminals 'on the base, 'aWire'connecting one of Saidterminals with the one of said standardsWhich Ais in'electrical contact with one ot said arms, and a Wirecon-Nil necting the remaining terminal with Said-v

